CVE-2026-31388: Apache OFBiz Auth Bypass Vulnerability

CVE-2026-31388 Overview

CVE-2026-31388 is an Improper Access Control vulnerability [CWE-284] affecting Apache OFBiz in multi-tenant deployments. The flaw exists in versions prior to 24.09.06 and allows unauthenticated network-based access to information that should be isolated between tenants. Apache OFBiz is an open-source enterprise resource planning (ERP) system used for accounting, e-commerce, customer relationship management, and supply chain workflows. In multi-tenant configurations, the platform enforces logical separation between tenants sharing the same infrastructure. This vulnerability weakens that separation boundary and exposes limited confidential data without requiring authentication or user interaction.

Critical Impact

Remote attackers can access information across tenant boundaries in shared Apache OFBiz deployments without authentication, undermining tenant isolation guarantees.

Affected Products

• Apache OFBiz versions prior to 24.09.06
• Multi-tenant Apache OFBiz deployments
• ERP, e-commerce, and CRM environments built on Apache OFBiz

Discovery Timeline

• 2026-05-19 - CVE-2026-31388 published to the National Vulnerability Database (NVD)
• 2026-05-19 - Apache project disclosure published via the Apache mailing list and Openwall oss-security list
• 2026-05-19 - Last updated in NVD database

Technical Details for CVE-2026-31388

Vulnerability Analysis

The vulnerability resides in how Apache OFBiz enforces access control boundaries between tenants in multi-tenant deployments. An attacker on the network can reach affected endpoints without supplying credentials and without user interaction. Because the issue is classified under [CWE-284] Improper Access Control, the root problem is an authorization gap rather than a memory safety or injection defect. Exploitation impacts confidentiality only, with no documented effect on integrity or availability. The scope remains unchanged, meaning the impact is contained to the OFBiz application context rather than crossing into other components.

Root Cause

The defect stems from missing or incomplete tenant-scope checks in Apache OFBiz request handling for multi-tenant environments. When the platform processes requests in a shared-tenant configuration, it fails to consistently validate that the requester is entitled to the targeted tenant context. This allows information owned by one tenant to be retrievable from outside that tenant's authorization boundary.

Attack Vector

The attack vector is network-based with low complexity. No privileges and no user interaction are required, which makes the vulnerability suitable for opportunistic scanning of internet-facing OFBiz instances. An attacker sends crafted HTTP requests to a multi-tenant OFBiz deployment to retrieve tenant-scoped information that should not be accessible without proper authorization. Single-tenant deployments are not in scope of this issue.

No public proof-of-concept code is available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. The current EPSS probability is 0.127%. Technical details are described in prose because no verified exploit code has been released; refer to the Apache Mailing List Thread and the Openwall OSS Security Update for vendor-provided context.

Detection Methods for CVE-2026-31388

Indicators of Compromise

• Anomalous HTTP requests to OFBiz tenant-aware endpoints originating from unauthenticated sessions
• Access patterns where a single client retrieves data spanning multiple tenant identifiers
• Unexpected responses containing tenant-scoped records returned to requests without valid tenant authorization

Detection Strategies

• Inventory all Apache OFBiz instances and identify which run in multi-tenant mode; flag versions earlier than 24.09.06
• Review web server and application logs for sequential or scripted access to tenant-aware URLs without prior authenticated session establishment
• Correlate WAF and reverse-proxy logs to identify cross-tenant identifier enumeration

Monitoring Recommendations

• Enable verbose access logging on OFBiz front-end servers and forward logs to a centralized analytics platform
• Alert on spikes in 200-status responses to endpoints that include tenant identifiers in path or query parameters
• Monitor egress traffic from OFBiz hosts for unexpected data volumes that could indicate bulk extraction

How to Mitigate CVE-2026-31388

Immediate Actions Required

• Upgrade Apache OFBiz to version 24.09.06 or later, which contains the official fix
• If patching cannot be completed immediately, restrict network exposure of multi-tenant OFBiz instances to trusted networks only
• Audit recent access logs for evidence of cross-tenant data retrieval prior to the upgrade

Patch Information

Apache has released Apache OFBiz 24.09.06 to remediate CVE-2026-31388. Administrators should follow the upgrade guidance in the Apache Mailing List Thread. After upgrading, validate tenant isolation by performing functional tests that confirm tenant-scoped requests reject unauthorized contexts.

Workarounds

• Place multi-tenant OFBiz deployments behind an authenticating reverse proxy or VPN until the upgrade is applied
• Apply WAF rules to block unauthenticated access to tenant-scoped URL patterns
• Temporarily disable multi-tenant mode where feasible and consolidate to single-tenant deployments until patched

# Configuration example: verify OFBiz version and plan upgrade to 24.09.06
cd /opt/ofbiz
./gradlew --version
git fetch --tags
git checkout release24.09
./gradlew cleanAll loadDefault